4.2 Rigging Equipment & Hand/Power Tools

Rigging Equipment & Hand/Power Tools

OSHA 510 candidates must understand the safety requirements for rigging materials and operating hand and power tools. These standards are covered under 29 CFR 1926 Subpart H (Materials Handling, Storage, Use, and Disposal) and Subpart I (Hand and Power Tools). Improper rigging is a major contributor to struck-by fatalities from falling loads, while hand and power tools present severe caught-in hazards (such as caught in rotating shafts or blades) and struck-by hazards (such as flying wood or metal fragments).

Rigging Equipment for Material Handling (29 CFR 1926.251)

Rigging equipment includes slings, shackles, hooks, chains, and wire ropes used to lift and move materials.

• Inspection Requirements (1926.251(a)(1)): A competent person must inspect all rigging equipment prior to use on each shift and as necessary during its use to ensure that it is safe. Defective rigging equipment must be tagged out and immediately removed from service.
• Identification and Rated Capacity (1926.251(a)(2)): All rigging equipment must be permanently marked with its rated capacity (working load limit). Slings must have legible capacity tags. Custom-designed lifting accessories (such as spreader bars, specialty grabs, or clamps) must be marked and proof-tested to 125% of their rated capacity prior to use.
• Safe Operating Practices: Never exceed the rated capacity of rigging gear. Slings must not be shortened with knots, bolts, or other makeshift devices. Slings must be protected from sharp edges of the load using softeners or padding to prevent cutting or damage. Slings must never be pulled from under a load while the load is resting on them.

Wire Rope, Shackles, and Slings

Different types of slings have specific inspection and safety requirements:

• Alloy Steel Chain Slings (1926.251(b)): Must have permanently attached, durable identification tags showing the size, grade, rated capacity, and manufacturer. Only alloy steel chains (Grade 80 or Grade 100) are permitted for overhead lifting. Chains must be inspected for wear, elongation (stretch), nicks, cracks, and gouges.
• Synthetic Web Slings (1926.251(e)): Synthetic web (nylon or polyester) slings are lightweight and flexible, but vulnerable to cuts and heat. They must be removed from service if there are acid or caustic burns, melting or charring, snags, punctures, tears, cuts, broken or worn stitches, or distortion of fittings. They must be immediately discarded if the internal red warning threads are visible.
• Wire Rope Slings: Knots are strictly prohibited in wire rope slings because they reduce the rope's capacity by up to 50%.
• Wire Rope Clip Installation: When using wire rope clips (U-bolts) to form an eye splice, the U-bolt must be installed correctly. The industry rule is "never saddle a dead horse." The U-bolt portion of the clip must clamp onto the dead (short, cut) end of the rope. The saddle (the forged part) must rest on the live (long, tensioned) end of the rope. Installing clips backward can crush the load-bearing wires of the live end, leading to catastrophic failure.
• Hook and Shackle Safety: Hooks must be equipped with active safety latches to prevent lines or slings from slipping out. A hook must be removed from service if its throat opening has increased by more than 15% of its original size, or if the hook is twisted more than 10 degrees out of its original plane.

Hand and Power Tool Safety & Guarding (29 CFR 1926.300)

All hand and power tools must be maintained in a safe condition. Employers are responsible for the safe condition of tools, including tools furnished by employees.

• Guarding (1926.300(b)): Moving parts of power tools—such as belts, gears, shafts, pulleys, sprockets, chains, flywheels, and projections—must be equipped with guards if they are exposed to contact by employees. Point of operation guards must prevent the operator from having any part of their body in the danger zone during the operating cycle.
• Personal Protective Equipment (1926.300(c)): Operators of power tools who are exposed to the hazard of falling, flying, abrasive, and splashing objects, or to harmful dusts, fumes, mists, vapors, or gases, must be provided with the appropriate personal protective equipment (PPE), such as safety glasses, face shields, hearing protection, and respirators.

Power-Operated Hand Tools (29 CFR 1926.302)

Power tools are classified by their power source: electric, pneumatic, fuel-powered, hydraulic, or powder-actuated.

• Tool Controls & Switches (1926.300(d)):
  • Constant-Pressure Switches (Dead-man control): Required on hand-held power drills, tappers, fastener drivers, horizontal/vertical/angle grinders, disc sanders, circular saws, chain saws, and percussion tools. The tool will shut off as soon as the operator releases pressure on the trigger.
  • On-Off Switches: Permitted only on tools with lower rotational hazard, such as routers, planers, laminate trimmers, shears, and jigsaw-type tools.
• Pneumatic Tools (1926.302(b)):
  • Pneumatic tools must be secured to the hose by a positive means, such as safety clips, retainers, or whip checks, to prevent the hose from whipping violently if the coupling disconnects.
  • Pneumatic nailers and staplers operating at more than 100 psi must have a safety device on the muzzle to prevent the tool from ejecting fasteners unless the muzzle is in contact with the work surface.
• Powder-Actuated Tools (1926.302(e)):
  • These tools operate like loaded firearms and require specialized training. Operators must carry a valid qualification card.
  • Tools must be tested daily before use and must never be loaded until immediately prior to firing.
  • They must not be operated in explosive or flammable atmospheres.
  • The muzzle end must have a protective shield or guard at least 3.5 inches in diameter to contain flying fragments.
  • Operators and assistants must wear eye and face protection.

Abrasive Wheel Grinders & Safety Controls (29 CFR 1926.303)

Abrasive grinding wheels operate at high speeds and can explode if they are damaged or improperly adjusted, creating a severe struck-by hazard.

• Work Rests (Tool Rests): The work rest must be adjusted to a maximum distance of 1/8 inch (0.125") from the wheel surface. This narrow gap prevents the work piece from becoming wedged between the wheel and the rest, which would cause the wheel to jam and shatter.
• Tongue Guards: The adjustable upper guard (tongue guard) must be kept adjusted to a maximum distance of 1/4 inch (0.25") from the wheel to contain sparks and wheel fragments.
• Ring Test: Before mounting a new grinding wheel, the user must perform a "ring test." The wheel is tapped gently with a light, non-metallic implement (like a wooden screwdriver handle). A sound wheel will produce a clear, metallic ring. A damaged or cracked wheel will produce a dull thud, indicating it is unsafe and must be discarded.
• Electrical Safety: Portable electric tools must be either grounded via a three-wire cord with a ground plug, or double-insulated (marked with a double square symbol). Power must be supplied through a Ground-Fault Circuit Interrupter (GFCI).

Hand and Power Tool Summary Table